What causes "error creating instanceGroup: %v" in kubernetes/kops?

Inspect the wrapped %v detail for the root cause

error creating instanceGroup: %v

Error message

error creating instanceGroup: %v

What it means

The InstanceGroup Create call failed with an error that is not IsAlreadyExists; RunCreate wraps the raw backend error with this prefix. It indicates the write to the state store itself failed, as opposed to a naming conflict.

Source

Thrown at cmd/kops/create.go:175

				clusterName = v.ObjectMeta.Labels[kopsapi.LabelClusterName]
				if clusterName == "" {
					return fmt.Errorf("must specify %q label with cluster name to create instanceGroup", kopsapi.LabelClusterName)
				}
				cluster, err := clientset.GetCluster(ctx, clusterName)
				if err != nil {
					return fmt.Errorf("error querying cluster %q: %v", clusterName, err)
				}

				if cluster == nil {
					return fmt.Errorf("cluster %q not found", clusterName)
				}

				_, err = clientset.InstanceGroupsFor(cluster).Create(ctx, v, metav1.CreateOptions{})
				if err != nil {
					if apierrors.IsAlreadyExists(err) {
						return fmt.Errorf("instanceGroup %q already exists", v.ObjectMeta.Name)
					}
					return fmt.Errorf("error creating instanceGroup: %v", err)
				}
				fmt.Fprintf(&sb, "Created instancegroup/%s\n", v.ObjectMeta.Name)

			case *kopsapi.SSHCredential:
				clusterName = v.ObjectMeta.Labels[kopsapi.LabelClusterName]
				if clusterName == "" {
					return fmt.Errorf("must specify %q label with cluster name to create SSHCredential", kopsapi.LabelClusterName)
				}
				if v.Spec.PublicKey == "" {
					return fmt.Errorf("spec.PublicKey is required")
				}

				cluster, err := clientset.GetCluster(ctx, clusterName)
				if err != nil {
					return err
				}

				sshCredentialStore, err := clientset.SSHCredentialStore(cluster)

View on GitHub (pinned to 4c8573c808)

Solutions

Inspect the wrapped %v detail for the root cause
Re-verify write permissions on the state store bucket/path
Retry the create after fixing credentials or connectivity
Check cluster state integrity with `kops get cluster -oyaml`

Defensive patterns

Strategy: retry

Validate before calling

// verify write access before create
obj, _, err := clientset.InstanceGroupsFor(cluster).List(ctx, metav1.ListOptions{})
if err != nil {
    return fmt.Errorf("no write access to state store: %v", err)
}

Try / catch

err := retry.OnError(wait.Backoff{Steps: 3, Duration: time.Second},
    func(err error) bool { return isTransient(err) },
    func() error { _, err := igs.Create(ctx, ig, metav1.CreateOptions{}); return err })

Prevention

Check IAM/bucket write permissions before automation runs
Monitor state store health (throttling, quotas)
Log the wrapped root-cause error for diagnosis

When it happens

Trigger: `kops create -f ig.yaml` where InstanceGroupsFor(cluster).Create fails due to state-store I/O errors, permission denied, invalid/invalidated backend configuration, or a validation rejection from the underlying clientset store.

Common situations: Expired cloud credentials mid-run; S3 bucket write permission removed; disk/full or throttled storage backend; corrupted cluster state in KOPS_STATE_STORE.

Related errors

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/5152d6c3843e5076. Report an issue: GitHub.